Just finished E-3 Hard. Didn't have nearly as much of a hard time as others have had, but it was definitely more time consuming than the last two maps. I'm not going to list anything for E-1 because it's literally "can you get 3+ ships to OASW? If yes 2CL 4DD, if no bring a CVL or a FBB."
E-2 I took a page out of Dai's book (many thanks, saved me a lot of digging early on when info kind of sucked):
Mizuho (Ro. 44, Zuin 12, Midget Sub)
Jintsuu (Gun x2, Night scout)
Tone (Gun x2, Zuin 12, Barrel)
Hatsuzuki (10cm x2, AA Radar)
Mutsuki (Daihatsu x3)
Kisaragi (Daihatsu x2, Barrel)
E-3 I messed with a few combinations from the recommended ships, and this was the only fleet that pathed BCGHJ (shortest). I unfortunately locked my Lv. 98 Yura in E-1, but Kinu did well despite her level.
Note that I swapped a Reppu 601st for a Ryuusei 601st on Taihou's second slot for the final kill. This loses AS+ on node G.
E-4 Hards only gives a Kou medal to make up the difference so I'll be dropping down to medium for Warspite, which is going to make my composition worthless . No Aquila or I-26 so far, not really interested in either so I'm not hoping for much in E-4 Otsu.